SyntaxError: Invalid regular expression

[dImrich]

Hello,
I have troubles with some titles.

Here is error

/home/admin/node/Project/node_modules/loopback-slug/lib/index.js:50
obj[options['slug']] = new RegExp('^' + strlug + '($|' + options.separator + ')');

SyntaxError: Invalid regular expression: /^1-wow-truly-stunning-blonde-beauty!($|-)/: Nothing to repeat
at new RegExp (native)
at make (/home/admin/node/Project/node_modules/loopback-slug/lib/index.js:50:32)
at Object.module.exports.middleware (/home/admin/node/Project/node_modules/loopback-slug/lib/index.js:129:9)
at /home/admin/node/Project/common/models/loop.js:9:18
at notifySingleObserver (/home/admin/node/Project/node_modules/loopback-datasource-juggler/lib/observer.js:160:22)
at /home/admin/node/Project/node_modules/loopback-datasource-juggler/node_modules/async/dist/async.js:3025:16
at replenish (/home/admin/node/Project/node_modules/loopback-datasource-juggler/node_modules/async/dist/async.js:881:17)
at /home/admin/node/Project/node_modules/loopback-datasource-juggler/node_modules/async/dist/async.js:885:9
at eachLimit$1 (/home/admin/node/Project/node_modules/loopback-datasource-juggler/node_modules/async/dist/async.js:3114:22)
at Object. (/home/admin/node/Project/node_modules/loopback-datasource-juggler/node_modules/async/dist/async.js:917:16)
at doNotify (/home/admin/node/Project/node_modules/loopback-datasource-juggler/lib/observer.js:157:11)
at doNotify (/home/admin/node/Project/node_modules/loopback-datasource-juggler/lib/observer.js:155:49)
at doNotify (/home/admin/node/Project/node_modules/loopback-datasource-juggler/lib/observer.js:155:49)
at doNotify (/home/admin/node/Project/node_modules/loopback-datasource-juggler/lib/observer.js:155:49)
at Function.ObserverMixin._notifyBaseObservers (/home/admin/node/Project/node_modules/loopback-datasource-juggler/lib/observer.js:178:5)
at Function.ObserverMixin.notifyObserversOf (/home/admin/node/Project/node_modules/loopback-datasource-juggler/lib/observer.js:153:8)